permanently restrained and enjoined from prohibiting developers from including in their apps and their metadata buttons, external links, or other calls to action that direct customers to purchasing mechanisms, in addition to In-App Purchasing and communicating with customers through points of contact obtained voluntarily from customers through account registration within the app.
The Verge
In coming days, lots and lots of ink will be spilled on this story and its implication. Its good to be a nerd.